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BDD testing framework for Elixir inspired by RSpec.
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lib/espec/assertions/match_pattern.ex
defmodule ESpec.Assertions.MatchPattern do
@moduledoc """
Defines 'match_pattern' (=) assertion.
it do: expect(actual).to match_pattern(expected)
"""
use ESpec.Assertions.Interface
defp match(subject, [pattern, env, vars]) do
pattern = Macro.expand(pattern, env)
result_quote = quote do: match?(unquote(pattern), unquote(Macro.escape(subject)))
{result, _} = Code.eval_quoted(result_quote, vars, env)
{result, result}
end
defp success_message(subject, [pattern, _env, _vars], _result, positive) do
data = Macro.to_string(pattern)
to = if positive, do: "matches", else: "doesn't match"
"`#{inspect(subject)}` #{to} pattern (=) `#{data}`."
end
defp error_message(subject, [pattern, _env, _vars], _result, positive) do
data = Macro.to_string(pattern)
to = if positive, do: "to", else: "not to"
but = if positive, do: "doesn't", else: "does"
"Expected `#{inspect(subject)}` #{to} match pattern (=) `#{data}`, but it #{but}."
end
end